The distance between an object and a convex lens is
changing. It is noticed that the size of the image formed on a
screen is decreasing. Is the object moving in a direction
towards the lens or away from it?
A shopkeeper wanted to fix a mirror which will give a maximum
view of his shop. What type of mirror should he use? Give
reason.
Two different type of lenses are placed on a sheet of newspaper.
How will you identify them without touching?
An erect and enlarged image of an object is formed on a screen.
Explain how this could be possible.
The concave reflecting surface of a torch got rusted. What
effect would this have on the beam of light from the torch?
The side mirror of a scooter got broken. The mechanic replaced it with a plane mirror. Mention any inconvenience that the driver of the scooter will face while using it?
Boojho made light from a laser torch to fall on a prism. Will he be able to observe a band of seven colours? Explain with a reason.
State whether the following statements are True or False.
(a) A concave lens can be used to produce an enlarged and
erect image.
(b) A convex lens always produces a real image.
(c) The sides of an object and its image formed by a concave
mirror are always interchanged.
(d) An object can be seen only if it emits light.
Fill in the blanks:
(a) The inner surface of a steel spoon acts as a ___________
mirror.
(b) The outer surface of a flat steel plate acts as a ___________
mirror.
(c) The outer shining surface of a round bottom steel bowl
acts as a __________ mirror.
(d) The inner surface of the reflector of a torch acts as a
__________ mirror.
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